Succession

***The following notes are taken directly from –Succession and stability, Chapter 20 of  Ecology:  Concepts and Applications, 5th edition, by Manuel C. Molles Jr.***

CHAPTER 20:  SUCCESSION AND STABILITY

*Succession is the change in plant, animal, and microbial communities in an area folloiwng disturbance or the creation of new substrate

*A pioneer community is the first plants in a successional sequence.

*Primary succession is the change in an ecological environment’s organisms–over time–which begins (solely) on newly formed volcanic surfaces such as lava flows.

*Secondary succession is the change in an ecological environment’s organisms–over time–which occurs after a distrubance of some sort (either due to natural disaster or human influence); there is soil and some organisms present.

*A climax community is  a community which comes late in the successional process–the populaiton of which remains stable until disrupted by disturbance.

*Community changes during succession include increases in species diversity and changes in species composition.

*Ecosystem changes during succession include increases in biomass, primary production, respiration, and nutrient retention.

*Mechanisms that drive ecological succession include facilitation, tolerance, and inhibition.

*Community stability may be due to lack of disturbance or community resistance or resilience in the face of distrubance.

*Stability is the absence of change.

*Resistance is the ability of a community or ecosystem to maintain structure and/or function in the face of disturbance.

*Resilience is the ability of a community or ecosystem to bounce back after a disturbance.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s